<template>
  <div class="login_container">
    <div class="login_box">

      <!-- 头像区域  -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="">
      </div>

      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="login_form">

        <!--  用户名  -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>

        <!--  密码  -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="iconfont icon-wendingkekao" type="password"></el-input>
        </el-form-item>

        <!--  按钮  -->
        <el-form-item class="btn">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>

      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  name: 'Login',
  data() {
    return {
      loginForm: {
        username: '',
        password: ''
      },
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          {required: true, message: "请输入登录名称", trigger: "blur"},
          {min: 3, max: 10, message: "长度在3到10个字符之间", trigger: "blur"}
        ],
        // 验证密码是否合法
        password: [
          {required: true, message: "请输入登录密码", trigger: "blur"},
          {min: 6, max: 10, message: "长度在6到10个字符之间", trigger: "blur"}
        ]
      }
    }
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid) false
        if (!valid) return;
        const {data: res} = await this.$http.post('login', this.loginForm);
        if (res.meta.status !== 200) {
          // return console.log('登录失败')
          return this.$message.error('登录失败')
        } else {
          // console.log('登录成功')
          //console.log(res)
          window.sessionStorage.setItem('token', res.data.token)
          //1. 将登录成功之后的 token,保存到客户端的 sessionStorage
          // 1.1 项目中除了登录之外的其他API接口,必须在登录之后才能访问到
          // 1.2 token 只应在当前网站打开期间生效,所以将 token 保存在 sessionStorage 中
          // 通过编程式导航跳转到后台主页 ,路由地址是 /home

          this.$message.success('登录成功')
          // 跳转页面
          this.$router.push('/home')
        }
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #ffffff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -50%);
  background-color: #fff;

  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.login_form {
  position: absolute;
  bottom: 0px;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btn {
  display: flex;
  justify-content: flex-end;
}
</style>
